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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32de3619182bdb182fb04bc5145e5fac3b23cfd02e9d3f83736c5133b3f840c1' 
  AND token = 'i0ZXrrkOeMA81o9MAnTuKciRMEq02XN3RpzLiEcd6rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}